Abstract
Accelerator-driven systems based on molten salt fuel have several unique advantages and features for advanced nuclear fuel utilization. The aim of this work was to study the Th-U breeding capability in such systems, known as “accelerator-driven subcritical molten salt reactors” (ADS–MSRs). Breeding capacities including conversion ratio and net \({}^{233}\hbox {U}\) production for various subcriticalities and different minor actinides (MA) loadings were analyzed for an ADS–MSR. The results show that the subcriticality of the core has a considerable effect on the Th-U breeding. A high subcriticality is favorable to improving the conversion ratio, increasing the net \({}^{233}\hbox {U}\) production, and reducing the doubling time. Specifically, the doubling time for \(k _{\mathrm{eff}}\) of 0.99 is larger than 80 years, while the counterpart for \(k _{\mathrm{eff}}\) of 0.93 is only approximately 22 years. Nevertheless, in an ADS–MSR with a high initial MA loading, MA results in a non-negligible \({}^{233}\hbox {U}\) depletion in the first two decades, while increasing the net \({}^{233}\hbox {U}\) production compared to reactors without MA loading. During the 50 years of operation, for the subcritical reactor (\(k _{\mathrm{eff}}=0.97\)) with MA fraction increasing from 1 to 14% , the net \({}^{233}\hbox {U}\) production increases from 3.94 to 8.24 t.
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This work was supported by the Chinese TMSR Strategic Pioneer Science and Technology Project (No. XDA02010000) and the Frontier Science Key Program of the Chinese Academy of Sciences (No. QYZDY-SSW-JSC016).
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Zhao, XC., Cui, DY., Cai, XZ. et al. Analysis of Th-U breeding capability for an accelerator-driven subcritical molten salt reactor. NUCL SCI TECH 29, 121 (2018). https://doi.org/10.1007/s41365-018-0448-3
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DOI: https://doi.org/10.1007/s41365-018-0448-3